Boring bit guide



June 9, 195 I B. SUI-c BORING BIT GUIDE Filed Aug. 51, 1950 II II ENTOR,

Patented June 9, 1953 UNITED STATES E ATENT OFFICE BORING BIT GUIDE Rodrick gulc, Prince George, Aptlicauon August 31, 1950, Serial No. 182i484 2 Claims. 1

This invention relates to woodworking and more particularly to an improved boring bit guide which may be used with hand or power operated boring tools for making dowel pin holes or a series of accurately aligned holes for any purpose.

Previous devices have been proposed for asimilar purpose, but they have been too complicated and expensive or were awkward to manipulate and not readily adjusted to all kinds of work.

time object of the present invention is to pro vide a simple and inexpensive dowel pin hole bor ing guide which will overcome the disadvantages enumerated above.

Another object of the present invention is to provide a dowel pin hole boring guide which may be readily adjusted to fit all kinds of work and accurately ali ned to drill holes in any desired position and having stop means adapted to be secured on the shank of the bit by which the maximum de 1th of the hole may be readily predetermined.

A still further object of the present invention to provide a hole boring guide which is prois the provision of a boring guide which is provided with a longitudinal bore flared outwardly adjacent the lower portion to provide for proper clearance when used with conventional bits and shaving outlet ooznn'lunioating with the bore.

Further objects and advantages of the invention will be apparent from the following description taken in conjunction with the accompanying drawing, wherein:

Fig. l is a top plan View of one preferred embodiment of the present invention;

Fig. 2, a side elevational View of the device shown in Fig. i;

Fig. 3, a front elevational view of the device shown in Fig. 1; and

Fig. i, a longitudinal sectional view of one of the interchangeable posts.

Referring now to the drawings in detail, a dowel pin hole boring guide ill is provided with an interohangeable bit guide post B? which is detach ably secured to a bracket guide plate iii by countersunk machine screws iii shown in dotted lines in Fig. 3.

Post it is provided in various sizes with a longitudinal cylindrical bore H3 to fit the different diameters of bits and drills with which the device may be used. -The lower part of the bore lfiis provided with an outwardly flared portion 2|) which is adapted to fit the flared end of wood bits and provide a slight clearance.

The front part of the lower enlarged portion 22 of the interchangeable post i2 is cut away to provide a shaving outlet Z i which communicates with the bore IS. The forward edge of the post it is beveled outwardly at it to a vertical surface which is contiguous and coplanar with the forward edge 39 of the guide plate i i. Surfaces 28 and 38 are shown as being provided with aligned marks 32 by which the device may be located for drilling a hole in the proper position. However, a single mark on either surface, preferably on surface would serve the purpose.

Adjustable clamps E l have a downwardly extending projection (iii and are slidably and adjustably mounted on guide plate i i by slotted machine screws 38 extending through elongated slots 443. Guide plate it also has a downwardly extending projection cl! with a threaded opening through which extends a tightening screw ii. A clamping plate it is swivelly mounted on the end of tightening screw it which is provided with'a T-handle An adjusting collar 5G is provided for use on the shank 52 of the boring bit 5% (shown in phantom lines in Fig. 2). The adjusting collar 50 is provided with a set screw 58 for tightening the collar on the shank for adjustably limiting the maximum depth of the hole.

In the use of the device, after the proper size bit has been selected, the corresponding post 12 is secured to the guide plate l4 by screws l6 and. the bit is inserted from the bottom into bore It. A mark is then placed on the contiguous sides of the two pieces to be doweled together, and guide plate is is set on the edge of one of the pieces with the marks 32 in alignment with the mark placed on the piece. The adjustable clamps 34 are adjusted by means of the screws 38 to proper ly locate the center of the bit from one side of the piece which is to be drilled, and the tightening screw it is rotated by handle it until the clamping plate 43 is in tight clamping engagement with the opposite surface of the piece. Stop member 50 is secured by set screw 56 at the proper position on the shank 52 by set screw 56' to provide for the depth of hole desired, and bit 65 is rotated in a conventional manner by the usual hand or power-operated boring tools.

The device of the present invention may obviously be used for many other purposes besides drilling holes for dowel pins, although it is ideally suited for this purpose. The guide may also be used for drilling a series of holes in the edge of a door or frame for the insertion of locks, and will serve equally well for drilling wood metal, plastics or other materials by using suitable drills or bits.

It will be obvious to those skilled in the art that various changes may be made in the invention without departing from the spirit and scope thereof and therefore this invention is not limited by that which is shown in the drawing or described in the specification, but only as indicated in the appended claims.

What is claimed is:

1. A boring bit guide comprising a guide plate for engagement with the edge of a plank or the like, a downwardly extending projection at one edge of the guide plate, a tightening means mounted on said projection of said guide plate with a handle for operating such tightening means, a pair of angle shaped clamp members mounted on said guide plate with one leg of each angle member extending in substantially parallel relation to the projection of said guide plate and the other leg of each angle member adjustably and slidably mounted on the upper side of said guide plate whereby the angle members may be adjusted so that the said one leg of each may be adjustably fixed in spaced relation to said projection, said clamp members being spaced laterally of said tightening means whereby when the guide is positioned on the edge of a plank the clamp members are spaced from said tightening means laterally and longitudinally providing a three point support, a tubular shaped drill guide having an enlarged end mounted on said guide plate between said clamp members with its enlarged end abutting the upper surface of said guide plate, means for removably securing said drill guide by its abutting end in fixed relation to said guide plate whereby different drill guides may be substituted.

2. A boring bit guide comprising a guide plate for engagement with the edge of a plank or the 4 like, a downwardly extending projection at one edge of the guide plate, a tightening means mounted on said projection of said guide plate with a handle for operating such tightening means, a pair of angle shaped clamp members mounted on said guide plate with one leg of each angle member extending in substantially parallel relation to the projection of said guide plate and the other leg of each angle member adjustably and slidably mounted on the upper side of said guide plate whereby the angle members may be adjusted so that the said one leg of each may be adjustably fixed in spaced relation to said projection, said clamp members being spaced laterally of said tightening means whereby when the guide is positioned on the edge of a plank the clamp members are spaced from said tightening means laterally and longitudinally providing a three point support, a tubular shaped drill guide having an enlarged end mounted on said guide plate between said clamp members with its enlarged end abutting the upper surface of said guide plate, means for removably securing said drill guide by its abutting end in fixed relation to said guide plate whereby different drill guides may be substituted, said drill guide having an enlarged bore adjacent its abutting end and being provided with a shaving outlet above said enlarged bore, and a collar for securement to a drill bit for engaging the upper end of said drill guide for limiting the penetration of the drill into the work.

BEDRICK SULC.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 917,488 Roberts Apr. 6, 1909 1,161,479 Kelley Nov. 23, 1915 1,233,813 Schneckloth July 17, 1917 1,629,053 Schrader May 17, 1927 1,762,457 Uhrin June 10, 1930 1,831,813 Levedahl Nov. 1'7, 1931 2,439,008 Kellem Apr, 6, 1948 

